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Watanuki-kannonyama-kofun is an one of Japanese ancient tumulus.
Kofun means tumulus and many of them had established on about 1500yr before in Japan, this period is caaled kofun-era in Japan.
Watanuki-kannonyama-kofun is located in Takasaki city, Gumma pref.
Its shape is very interesting and it is said "Key-hole Type".
Watanuki-kannonyama-kofun has [a burial stone chamber](https://sketchfab.com/3d-models/burial-chamber-of-watanuki-kannonyama-kofun-3192f6ab3ea2440496eb4eb5a20cb40a) at the side of the spherical part of tumulus.
A king in this area was buried in it.
This chamber is empty now and you may enter in it if you visit here.